It is estimated that ______ square km land has been converted to unproductive deserts in the last 50 years:

Related Mcqs:

1. The Cholistan and Thar deserts comprise ______

   A. Duneland
   B. Consisting of ridges of sand
   C. Drifted and piled up by wind
   D. All of the above

2. The deserts of the world are discontinuously distributed in a pair of parallel belts lying about ______ North and South of the equator.

   A. 25
   B. 30
   C. 35
   D. 40

3. A minima rotation worth the name is specified which corresponds to the age at which the trees reach the exploitable size which is usually 120 years, but is 150 years for the deodar, fir and kail in the moist zone of Kaghan 200 years for the ry zone of ______

   A. Swat
   B. Naran
   C. Kaghan
   D. None of these

4. Desert can be converted into green land by:

   A. Oxylophytes
   B. Psammophytes
   C. Halophytes
   D. Tropical trees

5. A country where _____ per cent of the total aea consists of moutains, gullied foot hills, arid waste and deserts, can never achieve the desired progress unless major part of this usable waste is harnessed to the advantage of its people:

   A. 50 to 55
   B. 55 to 60
   C. 65 to 70
   D. None of these

6. Deserts plants have longer root system because:

   A. High temperature of soil encourages root growth
   B. Low temperature at night encourages root growth
   C. Those plants adapted to produce long system can survive better in desert
   D. Roots grow in search of water

7. The deserts of Pakistan is:

   A. Siahan
   B. Thar
   C. Thal
   D. Cholistan
   E. All of the above

8. Which of the following prevents afforestation in deserts:

   A. Goat and grazing animals
   B. Local resident
   C. Unfertility of soil
   D. Low rainfall

9. The Namib and the Kalahari deserts in:

   A. Southern Africa
   B. Northern Africa
   C. Both (a) & (b)
   D. None of these

10. The biggest desert belt running from the Atlantic to _______ , including Sahara and some other samaller deserts such s the Arabian Desert (Arrub-al-Khali):

    A. China
    B. India
    C. Australia
    D. Iran